Sound Oscilloscope

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This is a science project that my daughter did in her after-school program. It's a "Sound Oscilloscope." It's really cool. The necessary parts are all cheap and easy to get. It makes interesting laser beam patterns on the wall, known as the Lissajous curves. It reminds me of all the engineering courses I took in college: wave theory, partial differential equations, eigenmodes and eigenvalues, the variational principle and Rayleigh-Ritz approximation, and all the analog-digital circuit experiments we did in electrical engineering labs, with real oscilloscopes. I am really glad that today's children get to play with all these cool toys. Not sure who invented this project for children, but it surely is fun.